91_Physics ProblemsTechnical Physics

91_Physics ProblemsTechnical Physics - 92*P4.22 Motion in...

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92 Motion in Two Dimensions *P4.22 When the bomb has fallen a vertical distance 2.15 km, it has traveled a horizontal distance x f given by x y x gx v f f f f i i i i i i i i = = = = ∴− = + = = ± F H I K = ± 3 25 2 15 2 437 2 2 150 2 437 9 8 2 437 2 280 2 150 2 437 371 19 1 6 565 4 792 0 1 2 6 565 6 565 4 1 4 792 3 283 3 945 2 2 2 2 2 2 2 2 2 2 2 . . . tan cos tan . cos tan . tan tan . tan . tan . . . . . . km km km m m m s m m s m m m 2 a f a f b g e j b g b g b g a f e j a f a fa f θ θ θ θ θ θ θ θ θ Select the negative solution, since θ i is below the horizontal. = − tan . θ i 0 662 , θ i = − ° 33 5 . P4.23 The horizontal kick gives zero vertical velocity to the rock. Then its time of flight follows from
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